Rainbow Electronics MAX1039 User Manual

General Description

The MAX1036–MAX1039 low-power, 8-bit, multichannel,
analog-to-digital converters (ADCs) feature internal
track/hold (T/H), voltage reference, clock, and an
I2C™-compatible 2-wire serial interface. These devices
operate from a single supply and require only 350µA at
the maximum sampling rate of 188ksps. Auto­Shutdown™ powers down the devices between conver­sions reducing supply current to less than 1µA at low
throughput rates. The MAX1036/MAX1037 have four ana­log input channels each, while the MAX1038/MAX1039
have twelve analog input channels. The analog inputs are
software configurable for unipolar or bipolar and single­ended or pseudo-differential operation.

The full-scale analog input range is determined by the
internal reference or by an externally applied reference
voltage ranging from 1V to VDD. The MAX1037/
MAX1039 feature a 2.048V internal reference and the
MAX1036/MAX1038 feature a 4.096V internal reference.

The MAX1036/MAX1037 are available in 8-pin SOT23
packages. The MAX1038/MAX1039 are available in 16­pin QSOP packages. The MAX1036–MAX1039 are guar­anteed over the extended industrial temperature range
(-40°C to +85°C). Refer to MAX1136–MAX1139 for 10-bit
devices and to the MAX1236–MAX1239 for 12-bit
devices.

Applications

Hand-Held Portable Applications
Medical Instruments
Battery-Powered Test Equipment
Solar-Powered Remote Systems
Received-Signal-Strength Indicators
System Supervision

Features

♦ High-Speed I2C-Compatible Serial Interface

400kHz Fast Mode

1.7MHz High-Speed Mode

♦ Single Supply

2.7V to 3.6V (MAX1037/MAX1039)

4.5V to 5.5V (MAX1036/MAX1038)

♦ Internal Reference

2.048V (MAX1037/MAX1039)

4.096V (MAX1036/MAX1038)

♦ External Reference: 1V to V

DD

♦ Internal Clock

♦ 4-Channel Single-Ended or 2-Channel Pseudo-

Differential (MAX1036/MAX1037)

♦ 12-Channel Single-Ended or 6-Channel Pseudo-

Differential (MAX1038/MAX1039)

♦ Internal FIFO with Channel-Scan Mode

♦ Low Power

350µA at 188ksps
110µA at 75ksps
8µA at 10ksps
1µA in Power-Down Mode

♦ Software Configurable Unipolar/Bipolar

♦ Small Packages

8-Pin SOT23 (MAX1036/MAX1037)
16-Pin QSOP (MAX1038/MAX1039)

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2442; Rev 0; 4/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

I2C is a trademark of Philips Corp.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

Pin Configurations and Typical Operating Circuit appear
at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX1036EKA-T -40°C to +85°C 8 SOT23-8 ±2 4 4.096 AAJE
MAX1037EKA-T -40°C to +85°C 8 SOT23-8 ±2 4 2.048 AAJG
MAX1038AEEE -40°C to +85°C 16 QSOP ±1 12 4.096 —
MAX1039AEEE -40°C to +85°C 16 QSOP ±1 12 2.048 —

TUE

(LSB)

INPUT

CHANNELS

INTERNAL

REFERENCE (V)

TOP

MARK

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 2.7V to 3.6V (MAX1037/MAX1039), VDD= 4.5V to 5.5V (MAX1036/MAX1038). External reference, V

REF

= 2.048V

(MAX1037/MAX1039), V

REF

= 4.096V (MAX1036/MAX1038). External clock, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND..............................................................-0.3V to +6V

AIN0–AIN11, REF to

GND ......................-0.3V to the lower of (V

DD

+ 0.3V) and +6V

SDA, SCL to GND.....................................................-0.3V to +6V

Maximum Current Into Any Pin .........................................±50mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SOT23 (derate 7.1mW/°C above +70°C).............567mW

16-Pin QSOP (derate 8.3mW/°C above +70°C).........666.7mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

)

)

DC ACCURACY (Note 1)

Resolution 8 Bits
Relative Accuracy INL (Note 2) ±1 LSB
Differential Nonlinearity DNL No missing codes over temperature ±1 LSB
Offset Error ±1.5 LSB

Offset Error Temperature
Coefficient

Gain Error (Note 3) ±1 LSB
Gain Temperature Coefficient ±1 ppm/°C

Total Unadjusted Error TUE

Channel-to-Channel Offset
Matching

Channel-to-Channel Gain
Matching

Input Common-Mode Rejection
Ratio

DYNAMIC PERFORMANCE (f

Signal-to-Noise Plus Distortion SINAD 49 dB

Total Harmonic Distortion THD Up to the 5th harmonic -69 dB

Spurious-Free Dynamic Range SFDR 69 dB

Channel-to-Channel Crosstalk (Note 4) 75 dB

Full-Power Bandwidth -3dB point 2.0 MHz

Full-Linear Bandwidth SINAD > 49dB 200 kHz

CONVERSION RATE

Conversion Time (Note 5) t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX1036/MAX1037 ±0.5 ±2
MAX1038A/MAX1039A ±0.5 ±1

CMRR Pseudo-differential input mode 75 dB

IN(sine wave

= 25kHz, VIN = V

CONV

Internal clock 6.1

External clock 4.7

REF(P-P

, f

SAMPLE

= 188ksps, RIN = 100Ω)

3 ppm/°C

±0.1 LSB

±0.5 LSB

LSB

µs

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1037/MAX1039), VDD= 4.5V to 5.5V (MAX1036/MAX1038). External reference, V

REF

= 2.048V

(MAX1037/MAX1039), V

REF

= 4.096V (MAX1036/MAX1038). External clock, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C.)

Throughput Rate f

Track/Hold Acquisition Time 588 ns

Internal Clock Frequency 2.25 MHz

Aperture Delay t

ANALOG INPUT (AIN0–AIN11)

Input Voltage Range, Single
Ended and Differential (Note 6)

Input Multiplexer Leakage Current

Input Capacitance C

INTERNAL REFERENCE (Note 7)

Reference Voltage V

Reference Temperature
Coefficient

Reference Short-Circuit Current 10 mA
Reference Source Impedance (Note 8) 675 Ω

EXTERNAL REFERENCE

Reference Input Voltage Range V

REF Input Current I

DIGITAL INPUTS/OUTPUTS (SCL, SDA)

Input High Voltage V

Input Low Voltage V

Input Hysteresis V

Input Current I

Input Capacitance C

Output Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Internal clock, SCAN[1:0] = 01
(MAX1036/MAX1037)

SAMPLE

AD

REF

TC

REF

REF

HYST

Internal clock, SCAN[1:0] = 00
CS[3:0] = 1011 (MAX1038/MAX1039)

External clock 188

External clock, fast mode 45

External clock, high-speed mode 30

Unipolar 0 V
Bipolar ±V

On/off-leakage current, V
no clock, f

IN

TA = +25°C

REF

(Note 9) 1.0 V

f

SAMPLE

IH

IL

VIN = 0 to V

IN

IN

I

OL

= 3mA 0.4 V

SINK

= 0

SCL

= 188ksps 14 30 µA

DD

AIN

MAX1037/MAX1039 1.925 2.048 2.171

MAX1036/MAX1038 3.850 4.096 4.342

_= 0 or V

DD,

0.7 x V

0.1 x V

±0.01 ±1µA

DD

DD

18 pF

120 ppm/°C

0.3 x V

15 pF

76

77

REF

/ 2

REF

DD

DD

±10 µA

ksps

ns

V

V

V

V

V

V

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1037/MAX1039), VDD= 4.5V to 5.5V (MAX1036/MAX1038). External reference, V

REF

= 2.048V

(MAX1037/MAX1039), V

REF

= 4.096V (MAX1036/MAX1038). External clock, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C.)

,

,

,

,

,

,

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER REQUIREMENTS

Supply Voltage (Note 10) V

Supply Current I

DD

MAX1037/MAX1039 2.7 3.6

DD

MAX1036/MAX1038 4.5 5.5

f

SAMPLE

188ksps

f

SAMPLE

75ksps

f

SAMPLE

10ksps

f

SAMPLE

1ksps

=

=

=

=

Internal REF, external clock 350 650

External REF, external clock 250

External REF, external clock 110

External REF, internal clock 150

External REF, external clock 8

External REF, internal clock 10

External REF, external clock 2

External REF, internal clock 2.5

Power-down 1 10

Power-Supply Rejection Ratio PSRR (Note 11) ±0.25 ±1 LSB/V

TIMING CHARACTERISTICS FOR 2-WIRE FAST MODE (Figures 1A and 2)

Serial Clock Frequency f

Bus Free Time Between a STOP
and a START Condition

Hold Time for Start Condition t

Low Period of the SCL Clock t

High Period of the SCL Clock t

Setup Time for a Repeated START
Condition (Sr)

Data Hold Time t

Data Setup Time t

Rise Time of Both SDA and SCL
Signals, Receiving

Fall Time of SDA Transmitting t

Setup Time for STOP Condition t

Capacitive Load for Each Bus Line C

Pulse Width of Spike Suppressed t

t

HD

SU

HD

SU

SU

SCL

t

BUF

LOW

HIGH

DAT

t

R

F

STO

B

SP

1.3 µs

STA

0.6 µs

1.3 µs

0.6 µs

STA

(Note 12) 0 150 ns

DAT

0.6 µs

100 ns

(Note 13) 20 + 0.1C

(Note 13) 20 + 0.1C

B

B

0.6 µs

TIMING CHARACTERISTICS FOR 2-WIRE HIGH-SPEED MODE (Figures 1B and 2)

Serial Clock Frequency f

Hold Time (Repeated) Start
Condition

Low Period of the SCL Clock t

High Period of the SCL Clock t

t

HD

SCLH

LOW

HIGH

(Note 14) 1.7 MHz

STA

160 ns

320 ns

120 ns

400 kHz

300 ns

300 ns

400 pF

50 ns

V

µA

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V to 3.6V (MAX1037/MAX1039), VDD= 4.5V to 5.5V (MAX1036/MAX1038). External reference, V

REF

= 2.048V

(MAX1037/MAX1039), V

REF

= 4.096V (MAX1036/MAX1038). External clock, f

SCL

= 1.7MHz, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +25°C.)

Note 1: The MAX1036/MAX1038 are tested at VDD= 5V and the MAX1037/MAX1039 are tested at VDD= 3V. All devices are config-

ured for unipolar, single-ended inputs.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and

offsets have been calibrated.

Note 3: Offset nulled.
Note 4: Ground ON channel; sine wave applied to all OFF channels.
Note 5: Conversion time is defined as the number of clock cycles (8) multiplied by the clock period. Conversion time does not

include acquisition time. SCL is the conversion clock in the external clock mode.

Note 6: The absolute voltage range for the analog inputs (AIN0–AIN11) is from GND to V

DD

.

Note 7: When AIN_/REF is configured to be an internal reference (SEL[2:1] = 11), decouple AIN_/REF to GND with a 0.01µF capacitor.
Note 8: The switch connecting the reference buffer to AIN_/REF has a typical on-resistance of 675Ω.
Note 9: ADC performance is limited by the converter’s noise floor, typically 1.4mV

P-P

.

Note 10: Electrical characteristics are guaranteed from V

DD(min)

to V

DD(max)

. For operation beyond this range, see the Typical

Operating Characteristics.

Note 11: Power-supply rejection ratio is measured as:

, for the MAX1037/MAX1039 where N is the number of bits (8) and V

REF

= 2.048V.

Power-supply rejection ratio is measured as:

, for the MAX1036/MAX1038 where N is the number of bits (8) and V

REF

= 2.048V.

Note 12: A master device must provide a data hold time for SDA (referred to V

IL

of SCL) in order to bridge the undefined region of

SCL’s falling edge (Figure 1).

Note 13: C

B

= total capacitance of one bus line in pF. tRand tFmeasured between 0.3VDDand 0.7VDD. Minimum specification is

tested at +25°C with C

B

= 400pF.

Note 14: f

SCLH

must meet the minimum clock low time plus the rise/fall times.

Setup Time for a Repeated START
Condition (Sr)

Data Hold Time tHD,

Data Setup Time tSU,

Rise Time of SCL Signal
(Current Source Enabled)

Rise Time of SCL Signal After
Acknowledge Bit

Fall Time of SCL Signal t

Rise Time of SDA Signal t

Fall Time of SDA Signal t

Setup Time for STOP Condition tSU,

Capacitive Load for Each Bus Line C

Pulse Width of Spike Suppressed t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VVVV

33 27

..

()−()

[]

FS FS

33 27

t

SU, STA

(Note 12) 0 150 ns

DAT

DAT

(Note 13) 20 80 ns

(Note 13) 20 160 ns

(Note 13) 20 80 ns

(Note 13) 20 160 ns

(Note 13) 20 160 ns

STO

B

SP

VV

..

−

t

RCL

t

RCL1

FCL

RDA

FDA

N

2

×

V

REF

160 ns

160 ns

10 ns

010ns

400 pF

VVVV

55 45

..

()−()

[]

FS FS

VV

55 45

..

−

×

N

2

V

REF

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

6 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= 3.3V (MAX1037/MAX1039), VDD= 5V (MAX1036/MAX1038), f

SCL

= 1.7MHz, external clock (33% duty cycle), f

SAMPLE

= 188ksps,

single ended, unipolar, T

A

= +25°C, unless otherwise noted.)

150

250

200

350

300

400

450

SUPPLY CURRENT

vs. VOLTAGE

MAX1036 toc01

VDD (V)

I

DD

(µA)

2.5 3.5 4.03.0 4.5 5.0 5.5

A) INTERNAL 4.096V

REF

B) INTERNAL 2.048V

REF

C) EXTERNAL 4.096V

REF

D) EXTERNAL 2.048V

REF

A

C

B

D

150

250

200

350

300

400

450

-40 85

SUPPLY CURRENT
vs. TEMPERATURE

MAX1036 toc02

TEMPERATURE (°C)

I

DD

(µA)

10-15 35 60

INTERNAL 4.096V

REF

INTERNAL 2.048V

REF

EXTERNAL 4.096V

REF

EXTERNAL 2.048V

REF

0

1

3

2

4

5

2.5 3.53.0 4.0 4.5 5.0 5.5

SHUTDOWN SUPPLY CURRENT

vs.

SUPPLY VOLTAGE

MAX1036 toc03

VDD (V)

I

DD

(µA)

SDA = SCL = V

DD

0

1

3

2

4

5

-40 10-15 35 60 85

SHUTDOWN SUPPLY CURRENT

vs.

TEMPERATURE

MAX1036 toc04

TEMPERATURE (°C)

I

DD

(µA)

SDA = SCL = V

DD

V

DD

= 5V

V

DD

= 3.3V

0

100

50

200

150

300

250

350

0203010 40 50 60

AVERAGE SUPPLY CURRENT vs.

CONVERSION RATE (INTERNAL CLOCK)

MAX1036 toc05

CONVERSION RATE (ksps)

AVERAGE I

DD

(µA)

A) INTERNAL REF ALWAYS ON
B) INTERNAL REF AUTOSHUTDOWN
C) EXTERNAL REF

A

C

B

INTERNAL CLOCK MODE

f

SCL

= 1.7MHz

0

150

100

50

300

250

200

450

400

350

500

0 10050 150 200

AVERAGE SUPPLY CURRENT VS.

CONVERSION RATE (EXTERNAL CLOCK)

MAX1036 toc06

CONVERSION RATE (ksps)

AVERAGE I

DD

(µA)

A

C

B

A) INTERNAL REF ALWAYS ON
B) INTERNAL REF AUTOSHUTDOWN
C) EXTERNAL REF

EXTERNAL CLOCK MODE

f

SCL

= 1.7MHz

0.9900

0.9925

0.9950

0.9975

1.0000

1.0025

1.0050

1.0075

1.0100

4.00 4.504.25 4.75 5.00 5.25 5.50

NORMALIZED 4.096V REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX1036 toc7

VDD (V)

V

REF

NORMALIZED

0.980

0.985

0.990

0.995

1.000

1.005

1.010

1.015

1.020

-40 -15 10 35 60 85

INTERNAL 4.096V REFERENCE VOLTAGE

vs. TEMPERATURE

MAX1036 toc08

TEMPERATURE (°C)

V

REF

NORMALIZED

0.9900

0.9925

0.9950

0.9975

1.0000

1.0025

1.0050

1.0075

1.0100

2.5 3.53.0 4.0 4.5 5.0 5.5

INTERNAL 2.048V REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX1036 toc09

VDD (V)

V

REF

NORMALIZED

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VDD= 3.3V (MAX1037/MAX1039), VDD= 5V (MAX1036/MAX1038), f

SCL

= 1.7MHz, external clock (33% duty cycle), f

SAMPLE

= 188ksps,

single ended, unipolar, T

A

= +25°C, unless otherwise noted.)

INTERNAL 2.048V REFERENCE VOLTAGE

vs. TEMPERATURE

1.020

1.015

1.010

1.005

1.000

NORMALIZED

0.995

REF

V

0.990

0.985

0.980

-40 -15 10 35 60 85

TEMPERATURE (°C)

FFT PLOT

0

-20

-40

-60

AMPLITUDE (dBc)

-80

-100

-120
0 100k

40k20k 60k 80k

FREQUENCY (Hz)

MAX1036 toc10

DIFFERENTIAL NONLINEARITY

0.5

0.4

0.3

0.2

0.1

0

DNL (LSB)

-0.1

-0.2

-0.3

-0.4

-0.5
0 10050 150 200 250 300

f

SAMPLE = 188ksps

f

IN = 25kHz

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

MAX1036 toc13

INTEGRAL NONLINEARITY

0.5

0.4

MAX1036 toc11

0.3

0.2

0.1

0

INL (LSB)

-0.1

-0.2

-0.3

-0.4

-0.5
0 10050 150 200 250 300

OFFSET ERROR vs. SUPPLY VOLTAGE

1.0
V

= 2.048V

REF

0.9

0.8

0.7

0.6

0.5

0.4

OFFSET ERROR (LSB)

0.3

0.2

0.1

0

2.5 3.53.0 4.0 4.5 5.0 5.5
VDD (V)

vs. DIGITAL CODE

DIGITAL OUTPUT CODE

MAX1036 toc14

MAX1036 toc12

OFFSET ERROR vs. TEMPERATURE

1.0
VDD = 3.3V

0.9

= 2.048V

V

REF

0.8

0.7

0.6

0.5

0.4

OFFSET ERROR (LSB)

0.3

0.2

0.1

0

-40 10-15 35 60 85

TEMPERATURE (°C)

MAX1036 toc15

GAIN ERROR vs. SUPPLY VOLTAGE

0

V

= 2.048V

REF

-0.01

-0.02

-0.03

-0.04

-0.05

-0.06

GAIN ERROR (LSB)

-0.07

-0.08

-0.09

-0.1

2.5 3.53.0 4.0 4.5 5.0 5.5
VDD (V)

MAX1036 toc16